When it comes to finding relationships between elements, we traditionally think of a top-down approach. We can thank CSS and
querySelectorAll for that relationship in selectors. What if we want to find an element's parent based on selector?
To look up the element tree and find a parent by selector, you can use
// Our sample element is an "a" tag that matches ul > li > a
const link = document.querySelector('li a');
const list = a.closest('ul');
closest looks up the ancestor chain to find a matching
parent element -- the opposite of traditional CSS selectors. You can provide
closest a simple or complex selector to look upward for!
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